Using CFLs exclusively, you want to have (at the minimum) 30w per square foot for the vegetative stage... preferably with a 'cooler', or blue color spectrum. For flower, you'll want to at least double the watts, and use bulbs that are 'warmer' or with more of a red color spectrum. The more lumens you can pack in, the better. Given that you're able to exchange air around the plant and keep the temperatures in check.

I'm just now starting to venture into the world of LEDs, but you should find some interesting LED facts and answers in these threads:

LED growing- An instructional grow log
The perfect LED grow light

And this is a great resource for anyone new to growing: Grow FAQs

Take care! :jointsmile: